Brillouin fiber laser using As38Se62 suspended-core chalcogenide fiber

Abstract

International audienceIn this paper, an all-fiber Brillouin laser ring cavity using a 3-m-long suspended-core chalcogenide As38Se62 fiber is reported for the first time to our knowledge. For a nonresonant ring cavity with no servo-locking, a laser threshold power of 37 mW and an efficiency of 26 % were obtained for a fiber having a core diameter of 5 μm. The linewidth of the Brillouin fiber laser and the pump laser were respectively measured to be below 4 kHz, the resolution of our autocorrelator, and 250 kHz, thus showing the linewidth-narrowing nature of the Brillouin laser. This result paves the way to compact Brillouin lasers with low threshold power and good spectral purity. A full experimental Brillouin characterization is also reported. We measured a Brillouin gain spectrum of 14.2 MHz, a Brillouin gain coefficient of 5.6x10-9 m/W and a Brillouin frequency shift of 7.95 GHz in our fiber

Inducing and harnessing stimulated Brillouin scattering in photonic integrated circuits

“…3) As 38 Se 62 fiber [6,128]. Although no significant reduction in the Brillouin threshold was achieved, due to high loss in the cavity, the Brillouin laser linewidth was nearly 3500 times smaller than the Brillouin gain linewidth and nearly 60 times smaller than the pump laser linewidth.…”

“…The time-scale on which SBS occurs is slow relative to other optical nonlinearities (occurring over nanoseconds rather than femtoseconds), and so SBS has historically been passed over for ultrafast optical processing applications, which have driven much research in the past two decades. However, SBS has been extremely useful in a number of areas, notably in ultra-narrowbandwidth lasers [2][3][4][5][6], sensing [7], slow-and fast-light , and microwave signal processing [30][31][32][33][34][35][36]. SBS can also be used to create dynamic acoustic gratings in the propagation material [23,32,[37][38][39][40][41][42][43][44][45][46][47][48]-these gratings can be used to reflect cross-polarized signals or to produce strong phase-conjugate beams through a process known as Brillouin-enhanced four-wave mixing (BEFWM) [49].…”

Linewidth-narrowing and intensity noise reduction of the 2nd order Stokes component of a low threshold Brillouin laser made of Ge_10As_22Se_68 chalcogenide fiber

“…A spectral characterization of the Brillouin gain spectrum was also done using a heterodyne detection from which a Brillouin frequency shift ν B of 7.25 GHz and a Brillouin gain linewidth Δν B of 17.6 MHz were measured. The values of g B , ν B and Δν B are slightly different from the measured values for a suspended-core AsSe fiber [12] but can be explained by the presence of germanium in the fiber composition [13]. The experimental setup of the single-frequency BFL used in this communication is illustrated on figure 1(b).…”

“…A g B of 4.5 ×10 −9 m/W was determined using the setup and method detailed in reference [12]. A spectral characterization of the Brillouin gain spectrum was also done using a heterodyne detection from which a Brillouin frequency shift ν B of 7.25 GHz and a Brillouin gain linewidth Δν B of 17.6 MHz were measured.…”

On-chip stimulated Brillouin scattering and its applications

“…Low threshold, low-frequency noise Brillouin lasers were recently demonstrated using silica wedge resonators, where both the pump and Stokes were aligned with the cavity resonances [22,23], and used for realizing a highly stable, on-chip microwave source. Here we discuss a different approach where only the Stokes signal experiences feedback [24] and use it to realize a photonic-chip based Brillouin laser. Figure 5 shows the principle of the Brillouin laser based on a chalcogenide photonic chip where on-chip tapers were used to improve coupling efficiency [25].…”